A107 Weather Theory and reports Flashcards
1
Q
Low clouds
A
-0-6500’
-Can have icing - Rime Icing
Stratus, stratocumulus, nimbostratus (heavy - nimbus)
2
Q
middle clouds
A
- 6500-20,000’
- Water, ice crystals, and supercooled
- Altostratus
- Moderate icing + turbulence
3
Q
High clouds
A
- > 20,000’
- Ice crystals -> no risk to icing
- Cirrus, cirrostratus, cirrocumulus
4
Q
Thunderstorms stages
A
Cumulus stage, mature stage, Dissipating stage
5
Q
Cumulus stage
A
- (3-5 mile height)
- All updraft as cloud forms
- Lifting Action
6
Q
Mature stage
A
- (5-10 mile height)
- Up and down drafts
- Most violent time
7
Q
Dissipating stage
A
- (5-7 mile height)
- All downdrafts
8
Q
Thunderstorm hazards
A
Updrafts and downdrafts, Large hail, Lightning, Tornadoes
9
Q
low level wind shear
A
- sudden drastic change in wind speed and/or direction in a very small area
- Violent up/down drafts, occurs at any altitude
- Wind changes of 180 degrees and Delta V of 50 or more
10
Q
Microburst
A
- Critical type of shear from convective precip or dry conditions
- Also occurs when temp/dew point very far apart
- 1 mile horz, 1000’ ft vertically
- 15 min lift span
- 6,000’ ft/min
- Wind dir change of 45 deg or more within seconds
11
Q
METAR
A
- Aviation routine weather report
- SPECI class - reported when wx changes are
- -Change in wind by 45 deg or more in 15 min or less w/ steady speed of 10 knots or more
- -Thunderstorms form or dissipate
- -Layer of clouds or obscuring phenomena form below 1,000’ AGL
- Observed 45-60th min of each hour, reported between 50-60*
- Reported out to 5 SM of airport
- VC indicator is for 5-10 miles ; can lead the precip // wx report
12
Q
-8 degrees at pueblo for true winds to transfer to magnetic
A
**
13
Q
Cold Front
A
cold, dense, stable air rapidly advances to displace a body of warmer air
14
Q
stationary front
A
Forces of two air masses are realatively equal
15
Q
occluded front
A
fast-moving cold front that catches up with slow moving warm front
